Which item would be considered a serious infraction under Category 1?

In the context of commodity regulation, a serious infraction under Category 1 typically pertains to situations that pose a significant health risk or safety concern. The mention of "bloody whites" refers to a condition where meat or poultry may be contaminated with blood or bodily fluids, which is unacceptable by health standards. This condition can indicate poor handling, processing practices, or violations of sanitary protocols, posing serious risks regarding food safety and public health.

The other options, while they may represent issues within commodity regulation, do not carry the same level of severity or immediate health threat as the presence of blood. Checks for quality are a standard practice to ensure product safety and compliance with regulations. Frozen items, while they require proper management to maintain quality, do not inherently represent a serious infraction. Non-fecal dirts might indicate some level of contamination, but they are typically not as critical in terms of health implications compared to contamination with blood or bodily fluids. Therefore, the identification of "bloody whites" as a serious infraction highlights the importance of maintaining health standards in handling and processing food products.